<template>
	<view class="xt__verify-code">
		<!-- 输入框 -->
		<input id="xt__input" :value="code" class="xt__input" :focus="isFocus" :password="isPassword" :type="inputType"
			:maxlength="itemSize" @input="input" @focus="inputFocus" @blur="inputBlur" />

		<!-- 光标 -->
		<view id="xt__cursor" v-if="cursorVisible && type !== 'middle'" class="xt__cursor"
			:style="{ left: codeCursorLeft[code.length] + 'px', height: cursorHeight + 'px', backgroundColor: cursorColor }">
		</view>

		<!-- 输入框 - 组 -->
		<view id="xt__input-ground" class="xt__input-ground">
			<template v-for="(item, index) in itemSize">
				<view :key="index"
					:style="{ borderColor: code.length === index && cursorVisible ? boxActiveColor : boxNormalColor }"
					:class="['xt__box', `xt__box-${type + ''}`, `xt__box::after`]">
					<view :style="{ borderColor: boxActiveColor }" class="xt__middle-line"
						v-if="type === 'middle' && !code[index]"></view>
					<text class="xt__code-text">{{ code[index] | codeFormat(isPassword) }}</text>
				</view>
			</template>
		</view>
	</view>
</template>
<script>
	/**
	 * @description 输入验证码组件
	 * @property {string} type = [box|middle|bottom] - 显示类型 默认：box -eg:bottom
	 * @property {string} inputType = [text|number] - 输入框类型 默认：number -eg:number
	 * @property {number} size = [1|2|3|4|5|6] - 支持的验证码数量 默认：6 -eg:6
	 * @property {boolean} isFocus - 是否立即聚焦 默认：true
	 * @property {boolean} isPassword - 是否以密码形式显示 默认false -eg:false
	 * @property {string} cursorColor - 光标颜色 默认：#cccccc
	 * @property {string} boxNormalColor - 光标未聚焦到的框的颜色 默认：#f7f7f7
	 * @property {string} boxActiveColor - 光标聚焦到的框的颜色 默认：#009254
	 * @event {Function(data)} confirm - 输入完成
	 */
	export default {
		name: 'xt-verify-code',
		props: {
			value: {
				type: String,
				default: () => ''
			},
			type: {
				type: String,
				default: () => 'box'
			},
			inputType: {
				type: String,
				default: () => 'number'
			},
			size: {
				type: Number,
				default: () => 6
			},
			isFocus: {
				type: Boolean,
				default: () => true
			},
			isPassword: {
				type: Boolean,
				default: () => false
			},
			cursorColor: {
				type: String,
				default: () => '#cccccc'
			},
			boxNormalColor: {
				type: String,
				default: () => '#f7f7f7'
			},
			boxActiveColor: {
				type: String,
				default: () => '#009254'
			}
		},
		model: {
			prop: 'value',
			event: 'input'
		},
		data() {
			return {
				cursorVisible: false,
				cursorHeight: 35,
				code: '', // 输入的验证码
				codeCursorLeft: [], // 向左移动的距离数组,
				itemSize: 6
			};
		},
		created() {
			this.cursorVisible = this.isFocus;
			this.validatorSize();
		},
		mounted() {
			this.init();
		},
		methods: {
			/**
			 *
			 */
			validatorSize() {
				if (this.size <= 6 && this.size > 0) {
					this.itemSize = Math.floor(this.size);
				} else {
					this.itemSize = 6;
				}
			},
			/**
			 * @description 初始化
			 */
			init() {
				this.getCodeCursorLeft();
				this.setCursorHeight();
			},
			/**
			 * @description 获取元素节点
			 * @param {string} elm - 节点的id、class 相当于 document.querySelect的参数 -eg: #id
			 * @param {string} type = [single|array] - 单个元素获取多个元素 默认是单个元素
			 * @param {Function} callback - 回调函数
			 */
			getElement(elm, type = 'single', callback) {
				uni
					.createSelectorQuery()
					.in(this)[type === 'array' ? 'selectAll' : 'select'](elm)
					.boundingClientRect()
					.exec(data => {
						callback(data[0]);
					});
			},
			/**
			 * @description 计算光标的高度
			 */
			setCursorHeight() {
				this.getElement('.xt__box', 'single', boxElm => {
					this.cursorHeight = boxElm.height * 0.6;
				});
			},
			/**
			 * @description 获取光标在每一个box的left位置
			 */
			getCodeCursorLeft() {
				// 获取父级框的位置信息
				this.getElement('#xt__input-ground', 'single', parentElm => {
					const parentLeft = parentElm.left;
					// 获取各个box信息
					this.getElement('.xt__box', 'array', elms => {
						this.codeCursorLeft = [];
						elms.forEach(elm => {
							this.codeCursorLeft.push(elm.left - parentLeft + elm.width / 2);
						});
					});
				});
			},
			// 输入框输入变化的回调
			input(e) {
				const value = e.detail.value;
				this.cursorVisible = value.length !== this.itemSize;
				this.$emit('input', value);
				this.inputSuccess(value);
			},
			// 输入完成回调
			inputSuccess(value) {
				if (value.length === this.itemSize) {
					this.$emit('confirm', value);
				}
			},
			// 输入聚焦
			inputFocus() {
				this.cursorVisible = this.code.length !== this.itemSize;
			},
			// 输入失去焦点
			inputBlur() {
				this.cursorVisible = false;
			}
		},
		watch: {
			value(val) {
				this.code = val;
			}
		},
		filters: {
			codeFormat(val, isPassword) {
				let value = '';
				if (val) {
					value = isPassword ? '*' : val;
				}
				return value;
			}
		}
	};
</script>
<style lang="scss" scoped>
	.xt__verify-code {
		position: relative;
		width: 100%;
		box-sizing: border-box;

		.xt__input {
			height: 100%;
			width: 200%;
			position: absolute;
			left: -100%;
			z-index: 1;
		}

		.xt__cursor {
			position: absolute;
			top: 50%;
			transform: translateY(-50%);
			display: inline-block;
			width: 2px;
			animation-name: cursor;
			animation-duration: 0.8s;
			animation-iteration-count: infinite;
		}

		.xt__input-ground {
			display: flex;
			justify-content: space-between;
			align-items: center;
			width: 100%;
			box-sizing: border-box;

			.xt__box {
				position: relative;
				display: inline-block;
				width: 88rpx;
				height: 100rpx;
				background: #F7F7F7;
				border-radius: 12rpx;
				margin-left: 20rpx;

				&-bottom {
					border-bottom: 1rpx solid #009254;
				}

				&-box {
					border: 1rpx solid #009254;
				}

				&-middle {
					border: none;
				}

				.xt__middle-line {
					position: absolute;
					top: 50%;
					left: 50%;
					width: 50%;
					transform: translate(-50%, -50%);
					border-bottom-width: 2px;
					border-bottom-style: solid;
				}

				.xt__code-text {
					position: absolute;
					top: 50%;
					left: 50%;
					font-size: 58rpx;
					transform: translate(-50%, -50%);
				}
			}
			.xt__box:nth-child(1){
				margin-left: 0;
			}
		}
	}

	@keyframes cursor {
		0% {
			opacity: 1;
		}

		100% {
			opacity: 0;
		}
	}
</style>
